.formula-chat-widget {
    position: fixed;
    right: 20px;
    bottom: 20px;
    z-index: 2500;
    font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.formula-chat-widget * {
    box-sizing: border-box;
}

.formula-chat-widget__toggle {
    width: 62px;
    height: 62px;
    border: 0;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 18px 36px rgba(15, 23, 42, 0.28);
    background: linear-gradient(135deg, #2563eb, #0f172a);
    color: #fff;
    font-size: 28px;
}

.formula-chat-widget__panel {
    position: absolute;
    right: 0;
    bottom: 78px;
    width: min(360px, calc(100vw - 24px));
    height: min(540px, calc(100vh - 110px));
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border-radius: 20px;
    border: 1px solid rgba(148, 163, 184, 0.22);
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 24px 60px rgba(15, 23, 42, 0.26);
    opacity: 0;
    pointer-events: none;
    transform: translateY(12px);
    transition: opacity .18s ease, transform .18s ease;
}

.formula-chat-widget--open .formula-chat-widget__panel {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.formula-chat-widget__header {
    padding: 16px 18px 12px;
    background: linear-gradient(135deg, #1d4ed8, #0f172a);
    color: #fff;
}

.formula-chat-widget__title {
    margin: 0;
    font-size: 18px;
    font-weight: 700;
}

.formula-chat-widget__subtitle {
    margin: 6px 0 0;
    font-size: 13px;
    line-height: 1.45;
    color: rgba(255,255,255,0.84);
}

.formula-chat-widget__status {
    margin-top: 8px;
    font-size: 12px;
    color: rgba(255,255,255,0.8);
}

.formula-chat-widget__messages {
    flex: 1;
    padding: 16px;
    overflow-y: auto;
    background: #f8fafc;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.formula-chat-widget__empty {
    padding: 12px 14px;
    border-radius: 14px;
    background: #fff;
    color: #475569;
    font-size: 14px;
    border: 1px solid rgba(148, 163, 184, 0.18);
}

.formula-chat-msg {
    max-width: 85%;
    padding: 11px 13px;
    border-radius: 16px;
    font-size: 14px;
    line-height: 1.45;
    white-space: pre-wrap;
    word-break: break-word;
}

.formula-chat-msg--client {
    align-self: flex-end;
    background: #1d4ed8;
    color: #fff;
    border-bottom-right-radius: 6px;
}

.formula-chat-msg--admin {
    align-self: flex-start;
    background: #fff;
    color: #0f172a;
    border: 1px solid rgba(148, 163, 184, 0.22);
    border-bottom-left-radius: 6px;
}

.formula-chat-msg__meta {
    display: block;
    margin-top: 5px;
    font-size: 11px;
    opacity: 0.72;
}

.formula-chat-widget__form {
    padding: 14px;
    background: #fff;
    border-top: 1px solid rgba(148, 163, 184, 0.18);
}

.formula-chat-widget__textarea {
    width: 100%;
    min-height: 88px;
    max-height: 150px;
    resize: vertical;
    border-radius: 14px;
    border: 1px solid rgba(148, 163, 184, 0.35);
    padding: 12px 14px;
    font: inherit;
}

.formula-chat-widget__actions {
    margin-top: 10px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.formula-chat-widget__hint,
.formula-chat-widget__error {
    font-size: 12px;
    color: #64748b;
}

.formula-chat-widget__error {
    color: #b91c1c;
}

.formula-chat-widget__send {
    border: 0;
    border-radius: 12px;
    padding: 11px 16px;
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    background: #1d4ed8;
    color: #fff;
}

.formula-chat-widget__send[disabled],
.formula-chat-widget__toggle[disabled] {
    opacity: .65;
    cursor: default;
}

@media (max-width: 640px) {
    .formula-chat-widget {
        right: 12px;
        bottom: 12px;
    }

    .formula-chat-widget__panel {
        width: min(100vw - 12px, 380px);
        bottom: 74px;
    }
}